US8324808B2 - LED lamp for producing biologically-corrected light - Google Patents

LED lamp for producing biologically-corrected light Download PDF

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Publication number
US8324808B2
US8324808B2 US13/174,339 US201113174339A US8324808B2 US 8324808 B2 US8324808 B2 US 8324808B2 US 201113174339 A US201113174339 A US 201113174339A US 8324808 B2 US8324808 B2 US 8324808B2
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color filter
led chips
biologically
led lamp
lamp
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US20120019140A1 (en
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Fredric S. Maxik
Robert R. Soler
David E. Bartine
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Eyesafe Inc
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Biological Illumination LLC
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Priority claimed from US12/842,887 external-priority patent/US8253336B2/en
Application filed by Biological Illumination LLC filed Critical Biological Illumination LLC
Priority to US13/174,339 priority Critical patent/US8324808B2/en
Priority to JP2013520746A priority patent/JP5907962B2/ja
Priority to CN201180036133.9A priority patent/CN103026131B/zh
Priority to EP11810175.7A priority patent/EP2596283B1/de
Priority to PCT/US2011/043884 priority patent/WO2012012245A2/en
Priority to TW100125951A priority patent/TW201231880A/zh
Assigned to WELLS FARGO BANK, NATIONAL ASSOCIATION, AS AGENT reassignment WELLS FARGO BANK, NATIONAL ASSOCIATION, AS AGENT SECURITY INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: BIOLOGICAL ILLUMINATION, LLC
Assigned to BIOLOGICAL ILLUMINATION, LLC reassignment BIOLOGICAL ILLUMINATION, LLC ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: BARTINE, DAVID E., MAXIK, FREDRIC S., SOLER, ROBERT R.
Assigned to ARES CAPITAL CORPORATION reassignment ARES CAPITAL CORPORATION SECURITY AGREEMENT Assignors: BIOLOGICAL ILLUMINATION LLC
Publication of US20120019140A1 publication Critical patent/US20120019140A1/en
Priority to US13/652,207 priority patent/US8643276B2/en
Application granted granted Critical
Publication of US8324808B2 publication Critical patent/US8324808B2/en
Priority to IL224378A priority patent/IL224378A/en
Priority to US13/803,825 priority patent/US8743023B2/en
Priority to HK13110166.2A priority patent/HK1182757A1/xx
Assigned to BIOLOGICAL ILLUMINATION, LLC reassignment BIOLOGICAL ILLUMINATION, LLC RELEASE BY SECURED PARTY (SEE DOCUMENT FOR DETAILS). Assignors: ARES CAPITAL CORPORATION
Assigned to BIOLOGICAL ILLUMINATION, LLC reassignment BIOLOGICAL ILLUMINATION, LLC RELEASE BY SECURED PARTY (SEE DOCUMENT FOR DETAILS). Assignors: WELLS FARGO BANK, NATIONAL ASSOCIATION
Priority to US14/260,371 priority patent/US9265968B2/en
Assigned to FCC, LLC D/B/A FIRST CAPITAL, AS AGENT reassignment FCC, LLC D/B/A FIRST CAPITAL, AS AGENT SECURITY INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: BIOLOGICAL ILLUMINATION, LLC, LIGHTING SCIENCE GROUP CORPORATION
Assigned to MEDLEY CAPTIAL CORPORATION, AS AGENT reassignment MEDLEY CAPTIAL CORPORATION, AS AGENT SECURITY INTEREST Assignors: BIOLOGICAL ILLUMINATION, LLC, LIGHTING SCIENCE GROUP CORPORATION
Priority to US14/573,922 priority patent/US9532423B2/en
Priority to US14/590,557 priority patent/US9827439B2/en
Assigned to ACF FINCO I LP reassignment ACF FINCO I LP ASSIGNMENT AND ASSUMPTION OF SECURITY INTERESTS IN PATENTS Assignors: FCC, LLC D/B/A FIRST CAPITAL
Priority to US15/370,802 priority patent/US9794996B2/en
Priority to US15/483,327 priority patent/US9974973B2/en
Assigned to LIGHTING SCIENCE GROUP CORPORATION, A DELAWARE CORPORATION, BIOLOGICAL ILLUMINATION, LLC, A DELAWARE LIMITED LIABILITY COMPANY reassignment LIGHTING SCIENCE GROUP CORPORATION, A DELAWARE CORPORATION RELEASE BY SECURED PARTY (SEE DOCUMENT FOR DETAILS). Assignors: ACF FINCO I LP, A DELAWARE LIMITED PARTNERSHIP
Priority to US15/935,391 priority patent/US10258808B2/en
Assigned to BIOLOGICAL ILLUMINATION, LLC, A DELAWARE LIMITED LIABILITY COMPANY, LIGHTING SCIENCE GROUP CORPORATION, A DELAWARE CORPORATION reassignment BIOLOGICAL ILLUMINATION, LLC, A DELAWARE LIMITED LIABILITY COMPANY RELEASE BY SECURED PARTY (SEE DOCUMENT FOR DETAILS). Assignors: MEDLEY CAPITAL CORPORATION
Priority to US16/271,208 priority patent/US10765886B2/en
Assigned to HEALTHE INC reassignment HEALTHE INC ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: BIOLOGICAL ILLUMINATION LLC
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21K—NON-ELECTRIC LIGHT SOURCES USING LUMINESCENCE; LIGHT SOURCES USING ELECTROCHEMILUMINESCENCE; LIGHT SOURCES USING CHARGES OF COMBUSTIBLE MATERIAL; LIGHT SOURCES USING SEMICONDUCTOR DEVICES AS LIGHT-GENERATING ELEMENTS; LIGHT SOURCES NOT OTHERWISE PROVIDED FOR
    • F21K9/00—Light sources using semiconductor devices as light-generating elements, e.g. using light-emitting diodes [LED] or lasers
    • F21K9/20—Light sources comprising attachment means
    • F21K9/23—Retrofit light sources for lighting devices with a single fitting for each light source, e.g. for substitution of incandescent lamps with bayonet or threaded fittings
    • F21K9/232—Retrofit light sources for lighting devices with a single fitting for each light source, e.g. for substitution of incandescent lamps with bayonet or threaded fittings specially adapted for generating an essentially omnidirectional light distribution, e.g. with a glass bulb
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V9/00—Elements for modifying spectral properties, polarisation or intensity of the light emitted, e.g. filters
    • F21V9/08—Elements for modifying spectral properties, polarisation or intensity of the light emitted, e.g. filters for producing coloured light, e.g. monochromatic; for reducing intensity of light
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61N—ELECTROTHERAPY; MAGNETOTHERAPY; RADIATION THERAPY; ULTRASOUND THERAPY
    • A61N5/00—Radiation therapy
    • A61N5/06—Radiation therapy using light
    • A61N5/0613—Apparatus adapted for a specific treatment
    • A61N5/0618—Psychological treatment
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21K—NON-ELECTRIC LIGHT SOURCES USING LUMINESCENCE; LIGHT SOURCES USING ELECTROCHEMILUMINESCENCE; LIGHT SOURCES USING CHARGES OF COMBUSTIBLE MATERIAL; LIGHT SOURCES USING SEMICONDUCTOR DEVICES AS LIGHT-GENERATING ELEMENTS; LIGHT SOURCES NOT OTHERWISE PROVIDED FOR
    • F21K9/00—Light sources using semiconductor devices as light-generating elements, e.g. using light-emitting diodes [LED] or lasers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V9/00—Elements for modifying spectral properties, polarisation or intensity of the light emitted, e.g. filters
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V9/00—Elements for modifying spectral properties, polarisation or intensity of the light emitted, e.g. filters
    • F21V9/20—Dichroic filters, i.e. devices operating on the principle of wave interference to pass specific ranges of wavelengths while cancelling others
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V19/00—Fastening of light sources or lamp holders
    • F21V19/001—Fastening of light sources or lamp holders the light sources being semiconductors devices, e.g. LEDs
    • F21V19/003—Fastening of light source holders, e.g. of circuit boards or substrates holding light sources
    • F21V19/0055—Fastening of light source holders, e.g. of circuit boards or substrates holding light sources by screwing
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V3/00—Globes; Bowls; Cover glasses
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED
    • F21Y2115/00—Light-generating elements of semiconductor light sources
    • F21Y2115/10—Light-emitting diodes [LED]

Definitions

  • the present invention relates to light sources; and more specifically to a light-emitting diode (LED) lamp for producing a biologically-corrected light.
  • LED light-emitting diode
  • Melatonin is a hormone secreted at night by the pineal gland. Melatonin regulates sleep patterns and helps to maintain the body's circadian rhythm. The suppression of melatonin contributes to sleep disorders, disturbs the circadian rhythm, and may also contribute to conditions such as hypertension, heart disease, diabetes, and/or cancer. Blue light, and the blue light component of polychromatic light, have been shown to suppress the secretion of melatonin. Moreover, melatonin suppression has been shown to be wavelength dependent, and peak at wavelengths between about 420 nm and about 480 nm. As such, individuals who suffer from sleep disorders or circadian rhythm disruptions continue to aggravate their conditions when using polychromatic light sources that have a blue light (420 nm-480 nm) component.
  • Curve A of FIG. 1 illustrates the action spectrum for melatonin suppression. As shown by Curve A, a predicted maximum suppression is experienced at wavelengths around about 460 nm. In other words, a light source having a spectral component between about 420 nm and about 480 nm is expected to cause melatonin suppression.
  • FIG. 1 also illustrates the light spectra of conventional light sources.
  • Curve B shows the light spectrum of an incandescent light source. As evidenced by Curve B, incandescent light sources cause low amounts of melatonin suppression because incandescent light sources lack a predominant blue component.
  • Curve C illustrating the light spectrum of a fluorescent light source, shows a predominant blue component.
  • fluorescent light sources are predicted to cause more melatonin suppression than incandescent light sources.
  • Curve D illustrating the light spectrum of a white light-emitting diode (LED) light source, shows a greater amount of blue component light than the fluorescent or incandescent light sources.
  • white LED light sources are predicted to cause more melatonin suppression than fluorescent or incandescent light sources.
  • the LED lamp includes a color filter, which modifies the light produced by the lamp's LED chips, to increase spectral opponency and minimize melatonin suppression. In doing so, the lamp minimizes the biological effects that the lamp may have on a user.
  • the LED lamp is appropriately designed to produce such biologically-correct light, while still maintaining a commercially acceptable color temperature and commercially acceptable color rending properties. Methods of manufacturing such a lamp are provided, as well as equivalent lamps and equivalent methods of manufacture.
  • FIG. 1 illustrates the light spectra of conventional light sources in comparison to a predicted melatonin suppression action spectrum for polychromatic light.
  • FIG. 2 is a perspective view of an LED lamp in accordance with one embodiment presented herein.
  • FIG. 3 is an exploded view of the LED lamp of FIG. 2 .
  • FIG. 4 is an exploded view of a portion of the LED lamp of FIG. 2 .
  • FIG. 5 is an exploded view of a portion of the LED lamp of FIG. 2 .
  • FIG. 6 is an exploded view of a portion of the LED lamp of FIG. 2 .
  • FIG. 7 is an exploded view of a portion of the LED lamp of FIG. 2 .
  • FIG. 8 illustrates an optimal transmission curve for a color filter in accordance with one embodiment presented herein.
  • FIG. 9 illustrates the light spectra of conventional light sources in comparison to the predicted melatonin suppression action spectrum for polychromatic light, as illustrated in FIG. 1 , and further including the light spectrum of an LED lamp in accordance with one embodiment presented herein.
  • FIG. 10 illustrates an optimal transmission curve for a color filter in accordance with one embodiment presented herein.
  • FIG. 2 is a perspective view of an LED lamp (or bulb) 100 in accordance with one embodiment presented herein.
  • LED lamp 100 includes a base 110 , a heat sink 120 , and an optic 130 .
  • LED lamp 100 further includes one or more LED chips and dedicated circuitry within LED lamp 100 .
  • LED lamp 100 has been designed to produce a biologically-corrected light.
  • biologically-corrected light is intended to mean “a light that has been modified to minimize or limit biological effects on a user.”
  • biological effects is intended to mean “any impact or change a light source has to a naturally occurring function or process.”
  • Biological effects may include hormone secretion or suppression (e.g., melatonin suppression), changes to cellular function, stimulation or disruption of natural processes, cellular mutations or manipulations, etc.
  • Base 110 is preferably an Edison-type screw-in shell.
  • Base 110 is preferably formed of an electrically conductive material such as aluminum.
  • base 110 may be formed of other electrically conductive materials such as silver, copper, gold, conductive alloys, etc.
  • Internal electrical leads are attached to base 110 to serve as contacts for a standard light socket (not shown).
  • heat sink 120 serves as means for dissipating heat away from one or more of the LED chips within LED lamp 100 .
  • heat sink 120 includes fins to increase the surface area of the heat sink.
  • heat sink 120 may be formed of any configuration, size, or shape, with the general intention of drawings heat away from the LED chips within LED lamp 100 .
  • Heat sink 120 is preferably formed of a thermally conductive material such as aluminum, copper, steel, etc.
  • Optic 130 is provided to surround the LED chips within LED lamp 100 .
  • the terms “surround” or “surrounding” are intended to mean partially or fully encapsulating.
  • optic 130 surrounds the LED chips by partially or fully covering one or more LED chips such that light produced by one or more LED chips is transmitted through optic 130 .
  • optic 130 takes a globular shape.
  • Optic 130 may be formed of alternative forms, shapes, or sizes.
  • optic 130 serves as an optic diffusing element by incorporating diffusing technology, such as described in U.S. Pat. No. 7,319,293 (which is incorporated herein by reference in its entirety).
  • optic 130 serves as a means for defusing light from the LED chips.
  • optic 130 may be formed of a light diffusive plastic, may include a light diffusive coating, or may having diffusive particles attached or embedded therein.
  • optic 130 includes a color filter applied thereto.
  • the color filter may be on the interior or exterior surface of optic 130 .
  • the color filter is used to modify the light output from one or more of the LED chips.
  • the color filter modifies the light so as to increase spectral opponency, and thereby minimize the biological effects of the light, while maintaining commercially acceptable color rendering characteristics.
  • a color filter in accordance with the present invention is designed to do more than simply filter out the blue component light from the LED chips. Instead the color filter is configured to take advantage of spectral opponency; namely the phenomenon wherein wavelengths from one portion of the spectrum excite a response, while wavelengths from another portion inhibit a response.
  • an LED lamp can be designed to maintain commercially acceptable color rendering properties, while minimizing the biological effects of the LED lamp.
  • the LED lamp can provide relief for people who suffer from sleep disorders, circadian rhythm disruptions, and other biological system disruptions.
  • FIG. 3 is an exploded view of LED lamp 100 , illustrating internal components of the lamp. As shown, in addition to the components described above, LED lamp 100 also includes at least a housing 115 , a printed circuit board (PCB) 117 , one or more LED chips 200 , a holder 125 , spring wire connectors 127 , and screws 129 .
  • PCB printed circuit board
  • PCB 117 includes dedicated circuitry to power, drive, and control one or more LED chips 200 .
  • PCB 117 includes at least a driver circuit and a power circuit.
  • the circuitry on PCB 117 serves as a means for driving the LED chips 200 .
  • the driver circuit is configured to drive LED chips 200 with a ripple current at frequencies greater than 200 Hz.
  • a ripple current at frequencies above 200 Hz is chosen to avoid biological effects that may be caused by ripple currents at frequencies below 200 Hz. For example, studies have shown that some individuals are sensitive to light flicker below 200 Hz, and in some instances experience aggravated headaches, seizures, etc.
  • LED chips is meant to broadly encompass LED dies, with or without packaging and reflectors, that may or may not be treated (e.g., with applied phosphors). In the embodiment shown, however, LED chips 200 are “white LED chips” having a plurality of blue-pumped (about 465 nm) LED dies with a phosphor applied thereto. In another embodiment, LED chips 200 are white LED chips having a plurality of blue-pumped (about 450 nm) LED dies with a phosphor applied thereto.
  • LED chips 200 employ a garnet based phosphor, such as a Yttrium aluminum garnet (YAG) or dual-YAG phosphors, orthosilicate based phosphors, or quantum dots to create white light.
  • LED chips 200 emit light having a color temperature between about 2500K and about 2900K, and more preferably about 2700K.
  • FIGS. 4-7 are exploded views of portions of LED lamp 100 .
  • FIGS. 4-7 illustrate how to assemble LED lamp 100 .
  • base 110 is glued or crimped onto housing 115 .
  • PCB 117 is mounted within housing 115 .
  • Insulation and/or potting compound may be used to secure PCB 117 within housing 115 .
  • Electrical leads (not shown) on PCB 117 are coupled to base 110 to form the electrical input leads of LED lamp 100 .
  • heat sink 120 is disposed about housing 115 .
  • two LED chips 200 are mounted onto heat sink 120 , and maintained in place by holder 125 . While two LED chips 200 are shown, alternative embodiments may include any number of LED chips (i.e., one or more).
  • Screws 129 are used to secure holder 125 to heat sink 120 . Screws 129 may be any screws known in the art (e.g., M2 plastite screws).
  • Spring wire connectors 127 are used to connect LED chips 200 to the driver circuit on PCB 117 .
  • LED chips 200 (with or without packaging) may be attached directly to heat sink 120 without the use of holder 125 , screws 129 , or connectors 127 .
  • optic 130 is then mounted on and attached to heat sink 120 .
  • FIG. 8 illustrates an optimal transmission curve for a color filter in accordance with one embodiment of the present invention.
  • the inventors have found that the transmission curve of FIG. 8 provides increased spectral opponency, which minimizes biological effects, while maintaining a commercially acceptable color rendering index.
  • application of a color filter having the transmission curve of FIG. 8 to LED lamp 100 results in a lamp having a color rendering index above 70, and more preferably above 80, and a color temperature between about 2,700K and about 3,500K, and more preferably about 3,015K.
  • LED lamp 100 produces no UV light.
  • LED lamp 100 produces 400-800 lumens.
  • the color filter is a ROSCOLUX #87 Pale Yellow Green color filter.
  • the color filter has a total transmission of about 85%, a thickness of about 38 microns, and is formed of a deep-dyed polyester film.
  • the color filter has transmission percentages within +/ ⁇ 10%, at one or more wavelengths, in accordance with the following table:
  • Wavelength Transmission (%) 360 59 380 63 400 60 420 50 440 45 460 53 480 75 500 78 520 79 540 78 560 77 580 74 600 71 620 67 640 63 660 61 680 60 700 64 720 74 740 81
  • FIG. 10 illustrates an optimal transmission curve for a color filter in accordance with one embodiment of the present invention.
  • the inventors have found that the transmission curve of FIG. 10 provides increased spectral opponency, which minimizes biological effects, while maintaining a commercially acceptable color rendering index.
  • the color filter is a ROSCOLUX #4530 CALCOLOR 30 YELLOW color filter.
  • the color filter has a total transmission of about 75%, a thickness of about 50 microns, and is formed of a deep-dyed polyester film.
  • the color filter has transmission percentages within +/ ⁇ 10%, at one or more wavelengths, in accordance with the following table:
  • Wavelength Transmission (%) 360 66 380 64 400 49 420 30 440 22 460 35 480 74 500 81 520 84 540 85 560 85 580 85 600 86 620 86 640 86 660 86 680 86 700 86 720 86 740 87
  • a biologically-corrected LED lamp having a plurality of blue-pump LED chips.
  • the LED chips may have a peak emission of about 450 nm.
  • the lamp further includes a color filter configured to attenuate the 450 nm emission and provide a polychromatic output with peak emissions at: about 475 nm with an about 25 nm half-peak width; about 500 nm with an about 30 nm half-peak width; and/or a peak between about 590 nm and about 625 nm with an about 20 nm half-peak width.
  • color filters with equivalent transmission characteristics may be formed of absorptive or reflective coatings, thin-films, body-colored polycarbonate films, deep-dyed polyester films, surface-coated films, etc.
  • pigment may be infused directly into the optic in order to produce the transmission filter effects.
  • phosphors and/or quantum dots may be employed as “means for increasing the spectral opponency of the light output to limit the biological effect of the light output.”
  • a combination of green converted and red converted phosphors can applied to the blue LED pump to create the light spectrum depicted in Curve E of FIG. 9 (discussed below).
  • a circadian-to-photopic ratio is defined as “the ratio of melatonin suppressive light to total light output.” More specifically, the circadian-to-photopic ratio may be calculated as a unit-less ratio defined as:
  • K 1 is set to equal K 2 .
  • P ⁇ is the spectral power distribution of the light source.
  • C( ⁇ ) is the circadian function (presented in the above referenced Figueiro et al. and Rea et al. publications).
  • V( ⁇ ) is the photopic luminous efficiency function (presented in the above referenced Figueiro et al. and Rea et al. publications).
  • the LED lamp produced in accordance with the present invention has a circadian-to-photopic ratio below about 0.10, and more preferably a circadian-to-photopic ratio below about 0.05, and most preferably a zero circadian-to-photopic ratio (i.e., no melatonin suppressive light is produced, although the lamp is generating a measurable amount of total light output).
  • a circadian-to-photopic ratio of a 2856K incandescent source to be about 0.138; of a white LED to be about 0.386; and of a fluorescent light source to be about 0.556.
  • FIG. 9 illustrates the light spectra of conventional light sources in comparison to the predicted melatonin suppression action spectrum, as illustrated in FIG. 1 , and further including the light spectrum of an LED lamp in accordance with one embodiment of the present invention (Curve E).
  • a color filter in accordance with the present invention does not necessarily filter out the entire blue component light of the LED chips.
  • Curve E shows a blue component spike at about 450 nm.
  • the color filter minimizes the biological effects of the light by compensating with spectral opponency.
  • the color filter is designed to increase the yellow component light, which is the spectral opponent of blue light. As such, the resulting light source can maintain commercially acceptable color rendering properties, while minimizing biological effects.
  • a biologically-corrected LED lamp comprising a housing; a driver circuit disposed within the housing; a plurality of LED chips electrically coupled to and driven by the driver circuit, wherein the plurality of LED chips produce a light output; and an optic element surrounding the plurality of LED chips.
  • the optic element has a color filter applied thereto.
  • the color filter is configured to increase spectral opponency to thereby decrease a melatonin suppressive effect of the light output of the plurality of LED chips.
  • the color filter may have a total transmission of about 75%, a thickness of about 50 microns, and is formed of a deep-dyed polyester film.
  • the lamp further comprises a heat sink disposed about the housing.
  • the plurality of LED chips are blue-pumped white LED chips.
  • light output of the plurality of LED chips has a color temperature between about 2,500K and about 2,900K. In another embodiment, the light output of the plurality of LED chips has a color temperature of about 2,700K.
  • the lamp has a color rendering index above 70, and a color temperature between about 2,700K and about 3,500K.
  • a biologically-corrected LED lamp comprising a housing; a driver circuit disposed within the housing; a plurality of LED chips electrically coupled to and driven by the driver circuit, wherein the plurality of LED chips produce a light output; and an optic element surrounding the plurality of LED chips.
  • the optic element has a color filter applied thereto.
  • the color filter is configured to increase spectral opponency to thereby decrease a melatonin suppressive effect of the light output of the plurality of LED chips.
  • the color filter is a ROSCOLUX #4530 CALCOLOR 30 YELLOW color filter.
  • a biologically-corrected LED lamp having a color rendering index above 70 and a color temperature between about 2,700K and about 3,500K, wherein the lamp produces a spectral power distribution that increases spectral opponency to thereby minimize melatonin suppression.
  • the lamp comprises: a base; a housing attached to the base; a power circuit disposed within the housing and having electrical leads attached to the base; a driver circuit disposed within the housing and electrically coupled to the power circuit; a heat sink disposed about the housing; a plurality of LED chips electrically coupled to and driven by the driver circuit, wherein the plurality of LED chips are coupled to the heat sink, wherein the plurality of LED chips are blue-pumped white LED chips that produce light having a color temperature of about 2,700K, and wherein the driver circuit is configured to drive the plurality of LED chips with a ripple current at frequencies greater than 200 Hz; and optic diffusing element mounted on the heat sink and surrounding the plurality of LED chips, wherein the optic diffusing element has a color filter applied thereto, and wherein the color filter is configured to increase spectral opponency to thereby decrease a melatonin suppressive effect of a light output from the plurality of LED chips.
  • the color filter has a transmission of about 22% at a wavelength of about 440 nm, a transmission of about 35% at a wavelength of about 460 nm, a transmission of about 74% at a wavelength of about 480 nm, a transmission of about 85% at a wavelength of about 560 nm, a transmission of about 85% at a wavelength of about 580 nm, and a transmission of about 86% at a wavelength of about 600 nm.
  • a white LED lamp in another example, there is provided a method of minimizing a biological effect produced by a white LED lamp, wherein the LED lamp includes a housing, a driver circuit disposed within the housing, a plurality of LED chips electrically coupled to and driven by the driver circuit, wherein the plurality of LED chips produce a light output, and an optic element surrounding the plurality of LED chips.
  • the method comprises applying to the optic element a color filter having a transmission of about 22% at a wavelength of about 440 nm, a transmission of about 35% at a wavelength of about 460 nm, a transmission of about 74% at a wavelength of about 480 nm, a transmission of about 85% at a wavelength of about 560 nm, a transmission of about 85% at a wavelength of about 580 nm, and a transmission of about 86% at a wavelength of about 600 nm.
  • the method may also comprise configuring the driver circuit to drive the LED chip with a ripple current at frequencies greater than 200 Hz.
  • a method of increasing spectral opponency of an LED lamp comprising: applying to the LED lamp a ROSCOLUX #4530 CALCOLOR 30 YELLOW color filter.

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Priority Applications (17)

Application Number Priority Date Filing Date Title
US13/174,339 US8324808B2 (en) 2010-07-23 2011-06-30 LED lamp for producing biologically-corrected light
JP2013520746A JP5907962B2 (ja) 2010-07-23 2011-07-13 生物学的補正光を生成するためのｌｅｄランプ
CN201180036133.9A CN103026131B (zh) 2010-07-23 2011-07-13 用于产生生物学校正光的led灯
EP11810175.7A EP2596283B1 (de) 2010-07-23 2011-07-13 Led-lampe zur erzeugung von biologisch korrigiertem licht
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US13/652,207 US8643276B2 (en) 2010-07-23 2012-10-15 LED lamp for producing biologically-corrected light
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US13/803,825 US8743023B2 (en) 2010-07-23 2013-03-14 System for generating non-homogenous biologically-adjusted light and associated methods
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US14/260,371 US9265968B2 (en) 2010-07-23 2014-04-24 System for generating non-homogenous biologically-adjusted light and associated methods
US14/573,922 US9532423B2 (en) 2010-07-23 2014-12-17 System and methods for operating a lighting device
US14/590,557 US9827439B2 (en) 2010-07-23 2015-01-06 System for dynamically adjusting circadian rhythm responsive to scheduled events and associated methods
US15/370,802 US9794996B2 (en) 2010-07-23 2016-12-06 System and methods for operating a lighting device
US15/483,327 US9974973B2 (en) 2010-07-23 2017-04-10 System and associated methods for dynamically adjusting circadian rhythm responsive to calendared future events
US15/935,391 US10258808B2 (en) 2010-07-23 2018-03-26 System and associated methods for dynamically adjusting circadian rhythm responsive to identified future events
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US20120019140A1 (en) 2012-01-26
EP2596283B1 (de) 2021-03-24
CN103026131B (zh) 2014-09-03
EP2596283A4 (de) 2017-11-29
TWI560404B (de) 2016-12-01
CN103026131A (zh) 2013-04-03
WO2012012245A3 (en) 2012-04-05
JP2013534352A (ja) 2013-09-02
US20130278137A1 (en) 2013-10-24
JP5907962B2 (ja) 2016-04-26
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IL224378A (en) 2015-10-29
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HK1182757A1 (en) 2013-12-06
TW201231880A (en) 2012-08-01

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